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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f4c7ef2545e0f7782a28512abb8352ba9dd8687a481364a08ce6502a35c5c9' 
  AND token = '0zJE8tUjZnPD3qnwjEneC75pE9SI9s4Nd8uzBuBwejc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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