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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dabb93adc8e6e99bf727bef89ea4dca9b3159c2c5f43d881c661c13de16e0d0' 
  AND token = 'mWPiJ413Jrg2/7G/aeURPZrvNR82tM192kPKjamK8DI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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