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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d5b12fabda105171752f425cd90acc4bb3489a0849a5ceddeb29ccdc8c71a9' 
  AND token = '1qMKR9+KTvFEJQn++OcdI+z33iTXm8drUW/b/+K0qrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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