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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89b4b904110c0a7fece1916abad45a68e2c20f8d1a8e3c0bb60a2d3527406090' 
  AND token = 'fdi48dwvt6eN9ShAiEuG5t+R1jfkOkHMNfy24UMe/qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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