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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbbdb926c0a3d9dcbfc2c8b943cd2792290b482116564c5b3042e23b71d2f2a' 
  AND token = '1D6sSChOdZc3XV2y2MVuPNAGp0cUtfaSlrNzgrbjOzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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