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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c070bc0cb533a9169c3cde00aa6a549c583e09d75c1d534afa10f78035a120d2' 
  AND token = '7DFY7gfwFhfPuEvkepAsKNsx/7mD2OqeK39AJd7N67I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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