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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950db0f58edb6dcca357a62f51b06e4dfa7f2a9ccd4741198209c25ea08db577' 
  AND token = 'rnf9sz3YImlZ9w4bdyFvuinEkoTDZQoC3uXW+TkXxok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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