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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce518ed36d4931b664ba93a3f4d8408d445dfd9e3854676534c2d53f669278ab' 
  AND token = 'bHuj0mRCDe5vc/jeY6oxGVIWjddtvdspbyxqSQZDZ2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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