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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d0f15d4bf1d85b4da3de0d7300844782c7a9a72b902df814d63b2a6502e588' 
  AND token = 'UPE0WdFH70Hn+8y1+tbHLCl0xwOLWJHBkNzEsJ9e8Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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