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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f452cfe944875e5eb7eb00e3a304f7f171e9889378db43b4a79e7e1be48414a' 
  AND token = 'FGLP3f+NW/6AjG7spYVXUIJerN9JNrargWmu6qbzzOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

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