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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c430e145c210437c2d47a0c79c55e94fcf52e705a235cbbd3b53c39bc2c49aba' 
  AND token = 'F4KAu/CdGs92Vez6VG48JhftZfQPa+XQdUCIKiVOiu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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