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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23e9b33a8c6579b3e5e612e180b961ff601630b59e944c5dd85b7e36c64bd28' 
  AND token = 'nUet4R5e4vlfIZKL7ijAydGj2wGbK1Zh5A5NOCDftQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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