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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51709a8de664681e93e49cf5667d44d066af6b910a90b6db0c00abf1cf1ab89' 
  AND token = 'sCuWUU5lAPYtiQbRQjuVDEaCB8IE5p3WNzgmEr6jMbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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