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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4cd84873fc127d1057caedc1b12354c649a1c8896079254865c99c987723e1' 
  AND token = 'EnVzAwVxk4AvvPDCmO7mFm3h0tPKcihKOAR7bmoYm5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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