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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9ef858b6e151ed0c1051f5cbdfe821195c980f1a5d5f3a9ccc12a7a59a4f74' 
  AND token = 'p1Z2H0y93WeV4TMqs6PXdhZwN2GlJI4mgsblNeuDFbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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