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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e509eb6f98e3de822c74f43b82df55b02ee5ef55646e8b5e7c744833b420362b' 
  AND token = 'eSzAbHW0K4KMPWJtojNhbcs5kcc2A7r8iCx7UU0iI+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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