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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f342b2c501c6d71009762881ca42a02929d020838b80cf5d5b0cbe47ebffba' 
  AND token = 'iqnbCeK+Xasas4XdR05VQ2k6aUYCBetG49xmcOSt6BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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