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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08d5b757f46bcea420d1187253409c7e5040ae4ca66b4a9bed30389fc1e8472' 
  AND token = 'Ehoykk3tVuBrO7MK5koHISAjQR726wImtLiZuD3qmGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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