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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fd38fe42bed600c0a77b201d75404a0b407b55d2412044fe953a3c32d25c79' 
  AND token = 'DTg4kh+jH0Na1i2ys06ayvSz9eL+83kAL+0Jhr5LW6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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