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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84944cc71f2d83993f1a3fc9e7912e4ae34e3a2fe8e2784742d8f089b86ec01f' 
  AND token = 'FELGHYkkArx++jNfT8LCMi1/GK/W8GPlEicxBNENY7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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