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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae7ac7891584a28de5385ef08cd950b6cc44cdb3306bc9b234007656530b90e' 
  AND token = 'Rs4/3F6G16QOxeU+2qVRo0mn/OmH4iwNWp4vuyHcyWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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