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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a70a65511b317cb3b5f7c73eae143c65404bbb8a941f7aafb661299d4fa4bb' 
  AND token = 'zTaFOGHbrriNJnqg18iWbidC4rBT80ea5AqJdQTIyYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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