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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4973c89ebc9aa9fd2bb5c1a5617b07670c4ec45293b052a3939ea111fbe04c9' 
  AND token = 'X+QKGKr57/U8yOGlZCMnpXDWyA95ArjMONKzhvtMTQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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