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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e8b4f6eeada78c2cb1dc39bab73383683e5c89d23876953be1bec53cf07065' 
  AND token = 'ZbEWJ2RdSJuAgz4irWK2PBzVUbem85va3efXwScyo9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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