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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b472ebeb5b214b138dd9a8e3fc6f11c35874ccc24dd9c354de9b098e880cfc3e' 
  AND token = 'VRHzGPbKAAC81oFGO/HLlUBOtNLguSRbu9DSKBBH1lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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