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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d694c1a100af053dc8b607fb153a6366878eb3cade0d375c0992f0fc3536d1d' 
  AND token = 'Ayc8l+bMZL84j5Wq5zV/Qxqvc/TjUlRGi927Dfej/Io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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