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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15807c0513101e27d7b284452e4453ce20812dfb602fd146bd6121606cba71fd' 
  AND token = 'ii0wYuWBZmVNeqnJLeYsXFAk+tduUSKNJ3YnKb/U9JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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