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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17a076da3efc1b0b38445cd7504c124491a434d2fbd7bdf0ae7133b832a9311' 
  AND token = 'i6xlFyZaQAzz/s3CkatVfoMRqbpSmi36h6wC03FRLjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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