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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28903a4f7bee606638a1d522a7edf02b0335a0452562ce87c7d649f6dc62b770' 
  AND token = 'pamknVzNk5V+MnsGd6kMnq9ayksrksEP7qxAV/VT/MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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