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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc43875d3b4185f828c89b309778a3aa71383c0308824078139168c0ed9b18d7' 
  AND token = 'YDvD3TPiLSUZkaMZUk9UqiPQD/wQOwIK56MbJzhL6EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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