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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05791831955c00f1594516c1c41df5c3d08596e775646ef76582b30a1252a879' 
  AND token = 'TDUn11sl99BbqE37iqt/VfVIPKd18xOBaueeNXRTdO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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