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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d4241066a7f006e30e85bc3ca408e245b13f6941af8adc8ea2ad7881a81c7d8' 
  AND token = 'zecefyqjgHV0H3fehhgRUla5RdDZ9JddYx869v/w5tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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