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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fad6efe5d32dda3f421dc495975216185ff404449158818e2bfaad912cfcda' 
  AND token = 'buFWjt0v5EW+Dbt1vls6GYv6fyakARKz8DQg+5qrPwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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