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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f63e61143a964a725461cd8b4a32afedf78b5e3d97fa41c29448b0fb38ba24f' 
  AND token = 'l/sC3oIfs4q6gcHPfRglYehamGvtjPQTa1TCiXgM/d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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