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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be46a89bbf13e9154f77c662753317efe719559b108c6fe2267c1432b5be05da' 
  AND token = '9sSQhXPTKMAg9fB8wphpczGaNrVcH0KGpaLEXQE4N5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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