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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe15a83e52f39f2fb200bca4540e7029e2a7daa8e812e2bb5379b814b6fdae87' 
  AND token = '2by43Y95IcqXXo/JlIzp2sNWakSx7ZatLdQM6DaLgyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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