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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec608f60fb92205bbcdf8b591e556e55cfb6038cc779801f0bc0a17770d6440' 
  AND token = 'x8BRegU4tGeI/2FQZcQrHuaK5/VSXlM8VlxR1c1AdXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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