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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdb70c48e6ad85a6cad497f14fd4ee2e7b71dd3579ef6d1508decb80fdc8d87' 
  AND token = '6lWq+dJM6md4apZlc+V6lCVjgQCrsqFflz2SqQdWqvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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