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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e1468664b9de86689e748323a8e0ebed81b3c387ea7463dce77d30e7c0a1a8' 
  AND token = 'lWFSZ7M+SJ5Z0iW2+Gqqmhj2bI08vMgMRhAqqOpRCy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}