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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e977da5d042d4cd9611b5de0b194157f3c9a9772614942efcc725e740f2e2dca' 
  AND token = 'mmmE87PkbE50OU6cLVYyQmixsUfT38kvq5M6HSAS8jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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