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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9be20fcc9f3263f08c8321d2a8ddaff102094d292ddc0af4ed4f8a053554a0' 
  AND token = 'XJLBFME1lCkuxxIcR9OV7MTo+War9Bfb9qjzEL04vo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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