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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddb435616d37a5b3bc8fe3d76702103b68dc5479c9f1a62482e51f16ca08117' 
  AND token = '8vzp01+dQReqHNQf9Qo/KCy0oOz6/t/McXdNZ2FB5vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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