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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdac2b78ac7a88fe336a9a886386dfe1387bf7af5f815a103a0d2b6bd4ffb1c' 
  AND token = 'Pi2/n/xkrM38tAsoj8BrPpH1BGJgY5I87ENhDR1aOmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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