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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8986e7db4bde167bcf65217ed50310b521f338e4aeff54abd8b6ba988c4b63b4' 
  AND token = 'FPPV8rT101hcvmo0z7l8japjr1ZIgI0RgQ5Khn4tKP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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