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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1534917ad37313f3205a1c66172038a751babc0b5a79b7ff8354c8ce5148510a' 
  AND token = '49Ntlb7egTN7j0jRn9POqWnfHszf3DOuDjaUGNOqwVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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