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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06032eca42c3cdf67ad98d11d4e553466b3916c16a748ce17e0040d65f25b502' 
  AND token = 'ckAatYTLNpt7FPZeS/gmC/3Tr3VPIWjj4+DQU6zq82Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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