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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '192f338eb8f188cf7a5d848e8d477c7e70f3ec469b8feadca8ec483d5b504d77' 
  AND token = 'Nj0Q5xi3zbnZpx8MxSNYwvAOXeHWrIRPKWy6W1UIOTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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