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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938e76325746af4f7b864a7fba1ccda61833bc9df1c94ac7d99d64d2d83ac957' 
  AND token = '351WNy/U/ToqdwcPdQeRjoYvae9pmkDdEJrJFaeuQ6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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