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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860fe04198d403b697575f5e04ec5b4d15b1f945295ad8f0275c8a449cb8007a' 
  AND token = 'vHCWVJva2qxtgzTPlNnL5GKokLnUsXUTYqkyTb4a3iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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