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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3efd75b3aef6d1a20567c2c696123574a1c41139fd43989e010c760af8e0d17' 
  AND token = '4bURjkPVqryPHlx5vP+h5A3jUS7GIqOXNd6yrl0B9Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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