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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0f984f308d2cfaeb3738f66cd3e6d7dd2fdf1ec4ce1e9f1709e505f08eedd7' 
  AND token = 'L/8h6PB2nd80axpHkNt65BMwLJCjaudL0cuF4YAfJks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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