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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ded0a0cc84175c130c439988cb8db8553b49cd401f61a9d3ce00afc167252ac' 
  AND token = 'SCjmjvnF83sGh4NlRDZlC5n+Q944uYpW0Flqm8nk3sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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