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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302c176db23471b67c2ffcb5775d7294077f8f11d94b7de04c0488dd0fc4fe2f' 
  AND token = 'VFy7jepssv7Egy5spWOiP5MArI/f+fJ9EzC18FPqvxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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