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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b10dceec4906a0e116a2c03dedd5c0969407ff4ed4a16e2c09a25f4f734b36e' 
  AND token = 'w6wtA4MEmU991gWA3zJ1v8H0DCjloXMdPkmCuJlAbTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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