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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4be96b07b6d9d21e934a69d346d1df2f372f61866ff118ce7bd8d0304f8c2a' 
  AND token = 'Svsq9sc11NcONoZqq68SaaJUwfgrhFepCEsX1gDv/Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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