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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458407a50f948972f9d62030b0c6438c189eff8c9907f502d4b48f12fd77f8f5' 
  AND token = 'fQAUzkHmemIy2vnE6J5gysZ9oL4GVYzxOWCoyOD3qXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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