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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a007deb5800a3ea7ecff559650a8a953a2c97317944f5044c3084f4ebc0ead4' 
  AND token = 'WZr34tZUvT0VzsF0DEa4Kt4X2fS8VCDQSDL7mNznwt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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