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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eade1846ca6b8449ba500a7803ca8cb2f21182f46cd46f8677cbb8e0b776f1ec' 
  AND token = 'wNfDHhZgom/7C1IPBMfbzati/Rv4Yek7to6xTNIQfZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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