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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ce350c5833e292ad279882b29ccf82d843d4fe044c3ed93f0974f23e3f5b03' 
  AND token = 'CLDxlwwoswczzZrUPDidTimMpSSASlf8gDgKGq5Hfx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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