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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5ea1526a886eb1708c9f3bea33572b89c8ef59712a2ac0c8c3d932feb95e0a' 
  AND token = 'DSNp+SI4vSDs7QV9sgFi6bqRaAeKNaWFk8ZfSbg2tyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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