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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b33aa961ad9bd260daeb1db8ef989e41dc5faeff7d89b70ffab4e00eadb7cbc' 
  AND token = 'w063N3T9FP/ma1teKnoVwRtsnTbP93Z9U2gn0gq9hcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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