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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0a1f0a7d6575efee31b2333e4d4e45fc5084594ff7ce96ac308b93a643fad4' 
  AND token = 'WkA+UWnn9wnv0NQCjCncoTO3im+5Z95RicMOgwm07jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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