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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41858f6c6bfc09730bdf6f201a8bb8c15183081def15bf8604fb4a9eef0aa68' 
  AND token = 's+RPDFI6w/SsyqtniSAyx5v5izpwdTfL2oUXMtCfois=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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