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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19346ef0180024311180d3770d96286344ced41372a6e04598d5803291cc6e45' 
  AND token = 'rWQnsIQIffwzvqBqTLyXQDoXwXyBzEjs6z/kxebTL1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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