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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcd94946d8619a76bb621b27cfb1fa529ca8eeb3e2a8345971c4ec98161a6a8' 
  AND token = 'azOQI9S58ipmXRaSv7PJAwmBjMSmx0nfrW7vBsDclyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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